AP Products 024-2001 LP Tank Check Sensor, 1 Pack

I have installed the unit on a 300 gal horizontal tank. The tank is located on the roof of what used to be an outside laundry room. Checking the tank meant I had to get a ladder and climb up to read the tank gauge.I installed the sensor as per the instructions . I used the option when setting up the app for the tank diameter. Checked it with the tank gauge. Well after about two months I have checked the tank gauge and the reading on the app and they are both the same.Very Happy With The Product.

Having been told by propane fillers that no instrument can measure the level in a tank and all were gimmicks, I decided to try this one out. I have now used this on a food truck 100 lbs propane tank for the last 2 months. This gauge is super accurate. The last time I let the level go down to 35% and knowing about 65% (15 gallons) were consumed, asked the filler to top up 15 exact gallons. The overflow valve activated at 14.5 gallons. I knew then that this is as accurate as I would desire. Now I monitor closely and fill up 12 gallons when 60% is consumed. Never worried about propane level in the tank anymore. I am sure there are other gauges that work too. This review is to simply confirm that this gauge works as advertised. Easy to install the app on the phone and then monitor once or twice a week. The position of the gauge needs to be experiment with to find the first reading output. Then mark the position with a permanent marker around the border of the instrument. I have marked on the tank bottom the exact position of the gauge which gives instant reading on the app. Now it is a breeze to monitor.

Bought the XL version! for our 500 lb LP tank. This sensor absolutely DOES NOT WORK!!. It will only give readings of 100% or 0% regardless of the tank level. I tried every location on the bottom of the tank. I called the manufacturer and was told the paint on the bottom of the tank is too thick so I sanded it down to bare metal and the sensor still could not read the level of the propane. Also per the call with the manufacturer, I even tried a dab of dielectric grease on the sensor but it didn't help. Don't waste your time and money!

Not all Android devices work with these sensors. In fact, I'd say probably few do. The manufacturer says the device must have 'Droid version 4.4 or later and must support Bluetooth 4.0. So that limits the choices pretty narrow already. But then - past that - there must be other limitations because I've tried three 'Droid tablets that don't work with the Mopeka sensors: (1) The 7" Samsung Galaxy Tab E, (2) the 8" Fusion5 tablet PC and (3) the Sipobuy 9" tablet PC. So I'd like to know from the manufacturer a list of Android devices they've specifically tested on and know to work.It seems that Mopeka has focused primarily on the iPhone app, which works pretty well. The sensors sync fast and work properly.Update as of January 29, 2019:The manufacturer stated that in December of 2018, Android 4.4 was updated and this disabled their TankCheck app from working. They have racted to this and made changes to their app so it now works with Android 4.4 again. I'm not sure about any other versions of the Android OS. But I do know that the TankCheck app now works on the 7" Samsung Galaxy Tab E, model SM-T113. Hopefully we can get a list going of other Android devices known to work.When you get connection established, you now need to position the sensor and configure the app to know the size of the tank. It needs to know the size of the tank so it can calculate the amount of fuel remaining. It does this by sending an acoustic signal through the tank and "listening" for the reflection at the top of the liquid column. Then it compares the height of the fuel column to the height of the tank, and uses that to calculate the amount of fuel remaining. That's why the app needs to know the size of the tank.The best position for the sensor is on the bottom of the tank. if the sensor can be placed there and the app configured with the proper size of the tank, you'll get a very accurate reading.But as many have said here, sometimes the tank is too dirty or rusty or the paint is too thick on the bottom. Then the acoustic interface is poor so the sensor can't get a good signal. You still have an option, but it's definitely a compromise. Tank sides are often less dirty and rusty, so the sensor might work when attached to the side of the tank.You can attach the sensor to the side of the tank, and it will tell you when the fuel level has dropped past this level. When you do this, the sensor will read 80-100% when the fuel level is above the sensor and 0-20% when it falls below it. That's not nearly as good as having the sensor on the bottom, but if the tanks are leased and you have no other choice, this is an option.To do this, measure the diameter of the tank and enter it into the app. Rather than choosing one of the standard size tanks, pick the "arbitrary" tank and enter the diameter rather than the height. Then place the sensor on the tank at the position where you want to be notified when the level has dropped below that point. It will go from "nearly full" (80-100%) to "nearly empty" (0-20%) when the fuel level drops below that.

Ok, it's not perfect because the tanks are not completely flat in the bottom where this device will place in my case and many people's cases but its better than guessing my tanks level all the time. This way I know and it will be close to empty at least.Steps: Grab the device and be close to the tank you want to measure. We are going to download an app, level the sensor on the device, and sync the device with our phone so we can measure the tank.1. Download the app called mopeka tank2. GO to the app in your phone and open it3. GO to the device and click sync4. At this point in your phone, you will hopefully see its syncing5. Once your phone find the device on the app, click your newly found device on your phone of course :)6. Now put your phone on the floor and click on your app - sensor leveling - let it level7. Now place your phone under your tank and wait a couple of seconds or as long as it takes to get something